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Properly make stacking contexts for inlines
Instead of making a stacking context out of inline fragments parent flow, make the inline fragment itself the stacking context. This fixes positioning and rendering of these sort of fragments and prevents over-layerization. Fixes #7424. Fixes #5812.
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fc98b8e126
commit
d572f1ca05
4 changed files with 123 additions and 58 deletions
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@ -1738,51 +1738,89 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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}
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pub trait InlineFlowDisplayListBuilding {
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fn build_display_list_for_inline_fragment_at_index(&mut self,
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index: usize,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext);
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fn build_display_list_for_inline(&mut self, layout_context: &LayoutContext);
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}
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impl InlineFlowDisplayListBuilding for InlineFlow {
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fn build_display_list_for_inline_fragment_at_index(&mut self,
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index: usize,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext) {
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let fragment = self.fragments.fragments.get_mut(index).unwrap();
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fragment.build_display_list(display_list,
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layout_context,
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&self.base.stacking_relative_position,
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&self.base
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.early_absolute_position_info
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.relative_containing_block_size,
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self.base
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.early_absolute_position_info
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.relative_containing_block_mode,
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BorderPaintingMode::Separate,
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BackgroundAndBorderLevel::Content,
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&self.base.clip,
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&self.base.stacking_relative_position_of_display_port);
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match fragment.specific {
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SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
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let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
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display_list.append_from(
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&mut flow::mut_base(block_flow).display_list_building_result)
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}
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SpecificFragmentInfo::InlineAbsoluteHypothetical(ref mut block_flow) => {
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let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
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display_list.append_from(
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&mut flow::mut_base(block_flow).display_list_building_result)
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}
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SpecificFragmentInfo::InlineAbsolute(ref mut block_flow) => {
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let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
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display_list.append_from(
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&mut flow::mut_base(block_flow).display_list_building_result)
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}
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_ => {}
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}
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}
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fn build_display_list_for_inline(&mut self, layout_context: &LayoutContext) {
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// TODO(#228): Once we form lines and have their cached bounds, we can be smarter and
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// not recurse on a line if nothing in it can intersect the dirty region.
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debug!("Flow: building display list for {} inline fragments", self.fragments.len());
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let mut display_list = box DisplayList::new();
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let mut has_stacking_context = false;
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for fragment in &mut self.fragments.fragments {
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fragment.build_display_list(&mut *display_list,
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layout_context,
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&self.base.stacking_relative_position,
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&self.base
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.early_absolute_position_info
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.relative_containing_block_size,
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self.base
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.early_absolute_position_info
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.relative_containing_block_mode,
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BorderPaintingMode::Separate,
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BackgroundAndBorderLevel::Content,
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&self.base.clip,
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&self.base.stacking_relative_position_of_display_port);
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has_stacking_context = fragment.establishes_stacking_context();
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// We iterate using an index here, because we want to avoid doing a doing
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// a double-borrow of self (one mutable for the method call and one immutable
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// for the self.fragments.fragment iterator itself).
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for index in (0..self.fragments.fragments.len()) {
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let establishes_stacking_context = {
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let fragment = self.fragments.fragments.get(index).unwrap();
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match fragment.specific {
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SpecificFragmentInfo::InlineBlock(_) |
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SpecificFragmentInfo::InlineAbsoluteHypothetical(_) => false,
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_ => fragment.establishes_stacking_context(),
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}
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};
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match fragment.specific {
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SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
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let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
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display_list.append_from(
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&mut flow::mut_base(block_flow).display_list_building_result)
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}
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SpecificFragmentInfo::InlineAbsoluteHypothetical(ref mut block_flow) => {
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let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
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display_list.append_from(
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&mut flow::mut_base(block_flow).display_list_building_result)
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}
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SpecificFragmentInfo::InlineAbsolute(ref mut block_flow) => {
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let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
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display_list.append_from(
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&mut flow::mut_base(block_flow).display_list_building_result)
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}
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_ => {}
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if establishes_stacking_context {
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let mut fragment_display_list = box DisplayList::new();
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self.build_display_list_for_inline_fragment_at_index(index,
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&mut *fragment_display_list,
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layout_context);
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let fragment = self.fragments.fragments.get(index).unwrap();
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display_list.positioned_content.push_back(DisplayItem::StackingContextClass(
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fragment.create_stacking_context(
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&self.base,
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fragment_display_list,
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ScrollPolicy::Scrollable,
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StackingContextCreationMode::Normal)));
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} else {
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self.build_display_list_for_inline_fragment_at_index(index,
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&mut *display_list,
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layout_context);
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}
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}
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@ -1791,30 +1829,7 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
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self.fragments.fragments[0].node);
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}
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// FIXME(Savago): fix Fragment::establishes_stacking_context() for absolute positioned item
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// and remove the check for filter presence. Further details on #5812.
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//
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// FIXME(#7424, pcwalton): This is terribly bogus! What is even going on here?
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if has_stacking_context {
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match self.fragments.fragments[0].specific {
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SpecificFragmentInfo::Canvas(_) | SpecificFragmentInfo::Iframe(_) => {}
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_ => {
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has_stacking_context =
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!self.fragments.fragments[0].style().get_effects().filter.is_empty()
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}
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}
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}
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self.base.display_list_building_result = if has_stacking_context {
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Some(DisplayList::new_with_stacking_context(
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self.fragments.fragments[0].create_stacking_context(
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&self.base,
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display_list,
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ScrollPolicy::Scrollable,
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StackingContextCreationMode::Normal)))
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} else {
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Some(display_list)
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};
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self.base.display_list_building_result = Some(display_list);
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if opts::get().validate_display_list_geometry {
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self.base.validate_display_list_geometry();
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